INGREDIENTS
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2 tbsp/30 g low-fat mayonnaise
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1 tbsp/15 ml nonfat Greek yogurt
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1/8 tsp lemon zest
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1 tsp/5 ml lemon juice
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4 slices multigrain bread
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4 leaves crisp lettuce (such as Boston, romaine or Bibb)
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4 thick slices beefsteak tomato
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4 thin slices Vidalia onion
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2 (3 1/4 oz/91 g) cans kippers, drained
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4 oz/112 g avocado, thinly sliced (optional)
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Freshly ground black pepper, to taste